Holding core for yarn spools, pirns, and the like

ABSTRACT

A segmental core element is formed of a plurality of similar part-cylindrical segments, each being a sector of a cylinder, and each sector having a central portion adapted to fit against a wind-up spindle and radially extending surrounding portions formed as an open cellular structure, preferably a hexagonal honeycomb structure.

United States Patent Odermatt 1 Sept. 23, 1975 HOLDING CORE FOR YARN SPOOLS, [56] References Cited PIRNS, AND THE LIKE UNITED STATES PATENTS [75] Inventor: Paul Odermatt, Steinhausen, 2.119.963 6/1938 Ramsdell 57/130 Switzerland 2.585.999 2/1952 Bunch 242/4621 2.720.075 10/1955 Cochran 242/46.2 X [73] Assignee: Maschinentabrik Schweiter AG,

Horgenv Switzerland FOREIGN PATENTS OR APPLICATIONS 506135 51939 U i d K d 1.57130 22 Filed: Feb. 27, 1974 mg Appl No.: 446,139

Foreign Application Priority Data Apr. 24. 1973 Switzerland 5802/73 US. Cl. 242/46.2; 57/130; 242/46.6; 242/118.32 Int. Cl. B6511 75/30; BH /22 Field of Search 242/118, 118.32. 118.3. 242/118.2. 46.2. 46.21. 46.5, 46.6, 130.1;

Primary Bram/ner-George F. Mautz Attorney. Agent. or Firm-Flynn 8L Frishauf [57] ABSTRACT A segmental core element is formed of a plurality of similar part-cylindrical segments. each being a sector of a cylinder, and each sector having a central portion adapted to fit against a wind-up spindle and radially extending surrounding portions formed as an open cellular structure, preferably a hexagonal honeycomb structure.

4 Claims, 1 Drawing Figure HOLDING CORE FOR YARN SPOOLS, PIRNS, AND THE LIKE The present invention relates to a holding core for yarn spools, pims, and the like, and more particularly to a core structure which can be used with a variety of pirn or spool core sleeves, or tubes, and which is adapted to be located on a wind-up spindle having a spreader arrangement.

Spooling machines require a large number of different Spool sleeves or core inserts which have to be matched to the length of the spooling sleeve, the form, the type of yarn or thread to be spooled, the size of the spool, and the like. Each separate spool sleeve or tube on which yarn is to be wound then requires a special core body to locate this tube on the spindle; in actual operation, therefore, a large number of different types of core bodies will be used which require substantial storage space and costly investment.

The core bodies must meet various requirements, among which low weight, exact centricity and good bearing surfaces are some of the more important. These requirements can be met only with substantial and extensive machining.

It is an object of the present invention to provide a core element or core body for yarn spooling installations which meets the requirements, is widely applicable, and which permits reduction of the necessary number of models to be stocked to a minimum, and preferably is so arranged that the number of models and types to be placed in stock depends only on the length of the spool tube or sleeve on which the yarn is to be wound.

SUBJECT MATTER OF THE PRESENT INVENTION Briefly, the core is formed as cylindrical segments, that is, as segments of a rotary cylindrical body; each segment is of open, cellular honeycomb construction and surrounds a core portion, adapted to fit against the drive spindle.

A structure, in accordance with the invention, permits stocking a single type of similar segmental elements of same length, so that the storage and stocking problems is reduced to stocking merely segments of different lengths. It is simple to shape the segmental elements by turning down the outer diameter, either by the manufacturer, or in the shop of the user, to match the core segments to any desired cylindrical or conical spool tube or sleeve, on which thread is to be wound. The cellular structure of the portion of the core which surrounds the center thereof results in a light-weight structure, independent of later shaping, for example by turning or removal of material, while providing substantial stiffness and a large surface for the interior of the spool sleeve or tube on which the yarn is to be wound.

In accordance with a feature of the invention, the walls of the cellular structure are hexagonal honeycomb, and so located that, within the limiting surfaces defining a sector, they extend parallel to the plane of symmetry of the respective segment.

The invention will be described by way of example with reference to the accompanying drawing, wherein the single FIGURE is a perspective view of the core element of the present invention.

Three similar segments 1, 2, 3 are so shaped that they form cylinder sectors of a body of rotation, that is, form sectors of a rotary, circular cylinder. in operation, the segments surround a spindle (not shown) of a spooling machine in such a manner that the radial position of the sectors is adjustable in dependence on spreading of the spindle. Thus, sleeves or tubes on which thread is to be wound, and slipped over the three rotary sectors, can be radially clamped, to rotate with the spindle. Such clamping and spreading arrangements and spindles are known.

Each one of the segments has a central portion and a surrounding open, cellular honeycomb portion. The cells are preferably hexagonal shaped; some of the cell walls 4, within the limiting walls 5, 6 which form sectorlimiting surfaces, are parallel to the plane of symmetry of the respective sector. The various individual cells are hexagonal; the walls 4 of the cells, the end walls 7 and 8, and the sector terminal walls 5 and 6 are all of approximately the same thickness. The various honeycomb cells may extend to a depth of about to 4/5 of the radial extent of the segment. The diameter of the three segmental bodies, together, is usually in the order of 10 to 15 cm; the axial length may vary widely and may extend to about /2 meter.

The segments are preferably made of aluminum alloy, as extrusions, or injection castings. The internal shape, and elements, which are to cooperate with the spreader arrangement of the specific spindle can be cast simultaneously; these are not shown since wellknown.

The casting types and shapes can be simple, permit ting efficient manufacture of the segments. The casting molds may be readily removed from the cast segments radially, and the castings, after having been made, usually come clean so that further working and finishing are unnecessary.

The open, cellular honeycomb construction of the segments results in very low weight of the entire core structure, while still providing substantial stiffness, and a large bearing surface for the sleeves or tubes to bc slipped thereover. The segmental body can be clamped circularly, and turned down to any desired diameter or shape, for example to be conical. The extent of material being removed is small, and hence the loss in material, upon removal of some of the surface portion will also be small.

Various changes and modifications may be made within the scope of the inventive concept; the hexagonal, honeycomb shape of the cells provides a stiff, easily arranged structure from which molds can readily be removed; other shapes may, however, be used and the term honeycomb used herein is not to be deemed limited to hexagonal cells.

I claim:

1. Segmental core insert to form a core element for winding bodies and to hold the winding bodies on the spooling spindles comprising a plurality of similar segments, each being a sector of a cylinder, each cylinder sector having a central portion adapted to fit against the spindle and a radially surrounding portion, said radially surrounding portion being formed as an open, cellular, honeycomb structure.

2. Core insert according to claim 1, wherein the cellular structure has radially extending wall portions, at least some of said wall portions being located parallel to the plane of symmetry of the segment.

3. Core insert according to claim 1, wherein the structure is a hexagonal honeycomb structure.

4. Core insert according to claim 1, wherein the depth of the cells of the cellular structure is about to 21 of the radial extent of the cylindrical portion.

l l k 

1. Segmental core insert to form a core element for winding bodies and to hold the winding bodies on the spooling spindles comprising a plurality of similar segments, each being a sector of a cylinder, each cylinder sector having a central portion adapted to fit against the spindle and a radially surrounding portion, said radially surrounding portion being formed as an open, cellular, honeycomb structure.
 2. Core insert according to claim 1, wherein the cellular structure has radially extending wall portions, at least some of said wall portions being located parallel to the plane of symmetry of the segment.
 3. Core insert according to claim 1, wherein the structure is a hexagonal honeycomb structure.
 4. Core insert according to claim 1, wherein the depth of the cells of the cellular structure is about 2/3 to 3/4 of the radial extent of the cylindrical portion. 